I love my space bags... there are however good quality ones and poor quality ones... the use of a bag should be fine for shipping, but agree with ouths of including instructions for proper storage.
I made a recent trip back from Tx... where my mother .. dear as can be.. but tends to purchase LARGE or BULKY gifts... I traveled via a single carryone suitcase. Well, mom bing mom.. she purchased a large fluffy queen size quilt, a fluffy robe, a number of pairs of thick sweatsuits and a jacket.... I used the large space bags ( 2 in my carry on suitcase) and everything made it home to MN.... My only fear was that TSA would open the suitcase/spacebags and then my good should be cooked ( one large space bag was too fluffy and large to close the suitcase before vacumming it down.. the 2nd large space bag fit nicely and flat on top of the other.... wt of suitcase 38 #..... I have used them in traveling before and yes,, u do need to be aware of fabric gets heavy quick!!